- The LAS point cloud and vendor project reports are available from [OpenTopography](http://opentopo.sdsc.edu/datasets).

Lidar was captured for Genesis Energy Limited by Aerial Surveys Limited in Feb 2015. The original dataset was generated by Aerial Surveys and their subcontractors. This reprocessed dataset was supplied by Aerial Surveys to Land Information New Zealand, and includes a large area (peripheral data from the original survey). The survey area is in the Mackenzie District of Canterbury, between Lake Tekapo, Lake Pukaki, Lake Ohau and Lake Ruataniwha. This area also includes Twizel Township. Data management and distribution is by Land Information New Zealand.

Released by LINZ under Creative Commons Attribution 4.0 New Zealand (CC BY 4.0) with:

Following Attribution:"Sourced from the LINZ Data Service and licensed by Land Information New Zealand, for re-use under CC BY 4.0."For details see: https://www.linz.govt.nz/data/licensing-and-using-data/attributing-elevation-or-aerial-imagery-data

The LiDAR sensor positioning and orientation (POS) was determined using the collected GPS/IMU datasets and Applanix POSPac software.

Benchmark: PUKAKI

Base Station Positions:

44 14 07.433570 S 170 07 00.766050 E 483.949 Ell Height

Antenna Height:

For 10th 1.401M for 11th 1.485M phase center

The POS data was combined with the LiDAR range files and used to generate LIDAR point clouds in NZTM and ellipsoidal heights. This process was undertaken using Optech LMS LiDAR processing software. The data was checked for completeness of coverage. The relative fit of data in the overlap between strips was also checked.

The height accuracy of the ground classified LiDAR points was checked using open land-cover survey check site data collected by Sounds Surveying Ltd. This was done by calculating height differences statistics between a TIN of the LiDAR ground points and the checkpoints. The standard deviation statistic is 0.038m; a RMS of 0.045m and the average difference is 0.022m. LiDAR is relative to the control check points.

The positional accuracy of the LiDAR data has been checked by overlaying Sounds Surveying Ltd surveyed data over the LiDAR data displayed coded by intensity. The data was found to fit well in position.

The point cloud data was then classified withTerraSolid LiDAR processing software into ground and above ground returns using automated routines tailored to the project landcover and terrain.